"It's that tricky thing where I'm not that guy - I don't look visually like the guy in the cartoon," he said. "I don't want to feel forced to do an impersonation of something else - [that's] a difficult thing to keep up over the course of a longer series.

"It's interesting that there's something that exists that you can watch, but Ben obviously is not going to be tied to the cartoon and who Gordon is in that.

"I'm [also] going to have to take a little bit of licence and bring Bullock more towards me."